longitudinally

/ˌlɑndʒəˈtudənəli/
adverb
  1. In a direction along the length of something, from one end to the other.
    • The scientist cut the plant stem longitudinally to study its internal structure.
    • The road runs longitudinally through the entire valley.
    • The ship was measured longitudinally from bow to stern.
  2. Over a period of time; in a way that follows the same subjects over many years.
    • The study examined the population longitudinally to understand long-term economic trends.
    • Data was collected longitudinally to observe changes in health over decades.
    • The researchers studied the children longitudinally, tracking their development from age 5 to 18.
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